How to declare a DWORD ?

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C++

Win32

What is wrong with this code line ?

DWORD quantityXreserved;

// I think there is a proper format
// For the variable name
// "quantityXreserved" , but
// I donot know how exactly

I am getting this error :

Intellisence identifier "DWORD" is undefined

What I have tried:

DWORD quantityXreserved;

// I am not sure but , I think it is
// something like this :

DWORD _quantityXreserved;